package world

// PrimitiveID is a compact stable identifier for primitives stored in the World.
// It is allocated by the World and may be reused after deletion (free-list).
type PrimitiveID uint32

// MapItem is the common interface implemented by all world primitives.
type MapItem interface {
	ID() PrimitiveID
}

// Point is a point primitive in fixed-point world coordinates.
type Point struct {
	Id   PrimitiveID
	X, Y int

	// Priority controls per-object draw ordering. Smaller draws earlier.
	Priority int
	// StyleID references a resolved style in the world's style table.
	StyleID StyleID

	// HitSlopPx expands hit-test radius in screen pixels (per-object override).
	// 0 means "use primitive default".
	HitSlopPx int
}

// Line is a line segment primitive in fixed-point world coordinates.
type Line struct {
	Id     PrimitiveID
	X1, Y1 int
	X2, Y2 int

	// Priority controls per-object draw ordering. Smaller draws earlier.
	Priority int
	// StyleID references a resolved style in the world's style table.
	StyleID StyleID

	// HitSlopPx expands hit-test radius in screen pixels (per-object override).
	// 0 means "use primitive default".
	HitSlopPx int
}

// Circle is a circle primitive in fixed-point world coordinates.
type Circle struct {
	Id     PrimitiveID
	X, Y   int
	Radius int

	// Priority controls per-object draw ordering. Smaller draws earlier.
	Priority int
	// StyleID references a resolved style in the world's style table.
	StyleID StyleID

	// HitSlopPx expands hit-test radius in screen pixels (per-object override).
	// 0 means "use primitive default".
	HitSlopPx int
}

// ID returns the point identifier.
func (p Point) ID() PrimitiveID { return p.Id }

// ID returns the line identifier.
func (l Line) ID() PrimitiveID { return l.Id }

// ID returns the circle identifier.
func (c Circle) ID() PrimitiveID { return c.Id }

// MinX returns the minimum X endpoint coordinate of the line.
func (l Line) MinX() int { return min(l.X1, l.X2) }

// MaxX returns the maximum X endpoint coordinate of the line.
func (l Line) MaxX() int { return max(l.X1, l.X2) }

// MinY returns the minimum Y endpoint coordinate of the line.
func (l Line) MinY() int { return min(l.Y1, l.Y2) }

// MaxY returns the maximum Y endpoint coordinate of the line.
func (l Line) MaxY() int { return max(l.Y1, l.Y2) }

// MinX returns the minimum X coordinate of the circle bbox.
func (c Circle) MinX() int { return c.X - c.Radius }

// MaxX returns the maximum X coordinate of the circle bbox.
func (c Circle) MaxX() int { return c.X + c.Radius }

// MinY returns the minimum Y coordinate of the circle bbox.
func (c Circle) MinY() int { return c.Y - c.Radius }

// MaxY returns the maximum Y coordinate of the circle bbox.
func (c Circle) MaxY() int { return c.Y + c.Radius }